GrandPrix, Impala 2006-2008, Monte Carlo 2006-2007

Heated Oxygen Sensor

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Removal & Installation




NOTE
When replacing the HO2S perform the following:



A code clear with a scan tool, regardless of whether or not a DTC is set
 
HO2S heater resistance learn reset with a scan tool, where available Perform the above in order to reset the HO2S resistance learned value and avoid possible HO2S failure
 

3.1L And 3.4L Engines
HO2S1

NOTE
The heated oxygen sensor may be difficult to remove when engine temperature is below 120°F (48°C). Excessive force may damage threads in exhaust manifold or exhaust pipe.

  1. Disconnect the heated oxygen sensor (HO2S) electrical connector. Use the Heated Oxygen Sensor Wrench J 39194-B to remove the heated oxygen sensor (HO2S).

    Click image to see an enlarged view

    Fig. Removing and installing HO2S1

  2.  

To install:


CAUTION
A special anti seize compound is used on the heated oxygen sensor threads. The compound consists of graphite suspended in fluid and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will already have the compound applied to the threads. If a sensor is removed from an engine and if for any reason is to be reinstalled, the threads must have anti seize compound applied before reinstallation.

  1. Coat the threads of heated oxygen sensor/catalyst monitor with anti seize compound P/N 12377953, or equivalent if necessary.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2.  
  3. Install the heated oxygen sensor (HO2S) and tighten the sensor to 31 ft. lbs. (42 Nm) using J 39194-B.
  4.  
  5. Connect the HO2S1 electrical connector.
  6.  

HO2S2

NOTE
The heated oxygen sensor may be difficult to remove when engine temperature is below 120°F (48°C). Excessive force may damage threads in exhaust manifold or exhaust pipe.

  1. Raise and support the vehicle.
  2.  
  3. Disconnect the HO2S electrical connector.
  4.  
  5. Use the Heated Oxygen Sensor Wrench J 39194-B to remove the heated oxygen sensor (HO2S).
  6.  

To install:


CAUTION
A special anti seize compound is used on the heated oxygen sensor threads. The compound consists of graphite suspended in fluid and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will already have the compound applied to the threads. If a sensor is removed from an engine and if for any reason is to be reinstalled, the threads must have anti seize compound applied before reinstallation.

  1. Coat the threads of heated oxygen sensor/catalyst monitor with anti seize compound P/N 12377953, or equivalent if necessary.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2.  
  3. Install the heated oxygen sensor (HO2S) and tighten the sensor to 31 ft. lbs. (42 Nm) using J 39194-B.
  4.  
  5. Connect the HO2S2 electrical connector.
  6.  

3.5L And 3.9L Engines
HO2S1

NOTE
Do not remove the pigtail from either the heated oxygen sensor (HO2S) or the oxygen sensor (O2S). Removing the pigtail or the connector will affect sensor operation. Handle the oxygen sensor carefully. Do not drop the HO2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Do not use cleaning solvents of any type. Do not repair the wiring, connector or terminals. Replace the oxygen sensor if the pigtail wiring, connector, or terminal is damaged. This external clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors, or terminals could result in the obstruction of the air reference and degraded sensor performance.


NOTE
The following guidelines should be used when servicing the heated oxygen sensor:



Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor causing poor performance.
 
Do not damage the sensor pigtail and harness wires in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems.
 
Ensure the sensor or vehicle lead wires are not bent sharply or kinked. Sharp bends or kinks could block the reference air path through the lead wire.
 
Do not remove or defeat the oxygen sensor ground wire, where applicable. Vehicles that utilize the ground wired sensor may rely on this ground as the only ground contact to the sensor. Removal of the ground wire will cause poor engine performance.
 
Ensure that the peripheral seal remains intact on the vehicle harness connector in order to prevent damage due to water intrusion. The engine harness may be repaired using Packard's Crimp and Splice Seals Terminal Repair Kit. Under no circumstances should repairs be soldered since this could result in the air reference being obstructed.
 

  1. Remove the connector position assurance (CPA) retainer.
  2.  
  3. Disconnect the heater oxygen sensor (HO2S) electrical connector .
  4.  
  5. Remove the oxygen sensor electrical connector from the ignition coil bracket.
  6.  
  7. Remove the HO2S from the exhaust manifold.

    Click image to see an enlarged view

    Fig. Removing and installing HO2S1-3.5L and 3.9L Engines

  8.  

To install:


CAUTION
A special anti seize compound is used on the heated oxygen sensor threads. The compound consists of graphite suspended in fluid and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will already have the compound applied to the threads. If a sensor is removed from an engine and if for any reason is to be reinstalled, the threads must have anti seize compound applied before reinstallation.

  1. Coat the threads of heated oxygen sensor/catalyst monitor with anti seize compound P/N 12377953, or equivalent if necessary.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2.  
  3. Install the oxygen sensor (HO2S) to the exhaust manifold and tighten the sensor to 31 ft. lbs. (42 Nm).
  4.  
  5. Connect the HO2S1 electrical connector.
  6.  
  7. Install the CPA retainer.
  8.  
  9. Install the oxygen sensor electrical connector to the ignition coil bracket.
  10.  

HO2S2
  1. Raise and support the vehicle.
  2.  
  3. Remove the connector position assurance (CPA) retainer.
  4.  
  5. Disconnect the heated oxygen sensor (HO2S) electrical connector.
  6.  
  7. Remove the HO2S electrical connector clip from the heat shield.
  8.  
  9. Remove the HO2S from the catalytic converter.
  10.  

To install:


CAUTION
A special anti seize compound is used on the heated oxygen sensor threads. The compound consists of graphite suspended in fluid and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will already have the compound applied to the threads. If a sensor is removed from an engine and if for any reason is to be reinstalled, the threads must have anti seize compound applied before reinstallation.

  1. Coat the threads of heated oxygen sensor/catalyst monitor with anti seize compound P/N 12377953, or equivalent if necessary.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2.  
  3. Install the oxygen sensor (HO2S) to the catalytic converter and tighten the sensor to 31 ft. lbs. (42 Nm).
  4.  
  5. Connect the HO2S1 electrical connector.
  6.  
  7. Install the CPA retainer.
  8.  
  9. Install the oxygen sensor electrical connector clip to the heat shield.
  10.  
  11. Lower the vehicle.
  12.  

3.8L Engine
Heated Oxygen Sensor-1

NOTE
The Heated Oxygen Sensor (HO2S) and the Oxygen Sensor use a permanently attached pigtail and connector. Do not remove this pigtail from the Heated Oxygen Sensor. Damage or the removal of the pigtail or the connector could affect the proper operation of the sensor. Take care when handling the HO2S and the O2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Also avoid using cleaning solvents of any type. Do not drop the HO2S or the O2S. Do not roughly handle the HO2S or the O2S.


NOTE
The heated oxygen sensor may be difficult to remove when engine temperature is below 120°F (48°C). Excessive force may damage threads in exhaust manifold or exhaust pipe.

  1. Remove the fuel injector sight shield.
  2.  
  3. Remove the heated oxygen sensor (HO2S) retaining clip.
  4.  
  5. Disconnect the HO2S electrical connector.
  6.  
  7. Remove the HO2S electrical connector from the fuel injector sight shield bracket.
  8.  
  9. Use the Oxygen Sensor Wrench J 39194 to remove the HO2S from the right exhaust manifold.

    Click image to see an enlarged view

    Fig. Removing and installing HO2S1-3.8L Engine

  10.  

To install:


CAUTION
A special anti seize compound is used on the heated oxygen sensor threads. The compound consists of graphite suspended in fluid and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will already have the compound applied to the threads. If a sensor is removed from an engine and if for any reason is to be reinstalled, the threads must have anti seize compound applied before reinstallation.

  1. Coat the threads of heated oxygen sensor/catalyst monitor with anti seize compound P/N 12377953, or equivalent if necessary.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2.  
  3. Install the oxygen sensor (HO2S) to the fuel injector sight shield bracket and tighten the sensor to 31 ft. lbs. (42 Nm).
  4.  
  5. To complete installation, reverse remaining removal procedure.
  6.  

HO2S2

NOTE
The Heated Oxygen Sensor (HO2S) and the Oxygen Sensor use a permanently attached pigtail and connector. Do not remove this pigtail from the Heated Oxygen Sensor. Damage or the removal of the pigtail or the connector could affect the proper operation of the sensor. Take care when handling the HO2S and the O2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Also avoid using cleaning solvents of any type. Do not drop the HO2S or the O2S. Do not roughly handle the HO2S or the O2S.


NOTE
The heated oxygen sensor may be difficult to remove when engine temperature is below 120°F (48°C). Excessive force may damage threads in exhaust manifold or exhaust pipe.

  1. Raise and support the vehicle.
  2.  
  3. Remove the heated oxygen sensor (HO2S) electrical connector retaining clip from the HO2S electrical harness connector.
  4.  
  5. Disconnect the HO2S electrical connector from the HO2S electrical harness connector.
  6.  
  7. Use the Oxygen Sensor Wrench J 39194 to remove the HO2S from the exhaust pipe.
  8.  

To install:


CAUTION
A special anti seize compound is used on the heated oxygen sensor threads. The compound consists of graphite suspended in fluid and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will already have the compound applied to the threads. If a sensor is removed from an engine and if for any reason is to be reinstalled, the threads must have anti seize compound applied before reinstallation.

  1. Coat the threads of heated oxygen sensor/catalyst monitor with anti seize compound P/N 12377953, or equivalent if necessary.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2.  
  3. Install the oxygen sensor (HO2S) to the exhaust pipe and tighten the sensor to 31 ft. lbs. (42 Nm).
  4.  
  5. To complete installation, reverse remaining removal procedure.
  6.  

5.3L Engine
HO2S1

NOTE
Do not remove the pigtail from either the heated oxygen sensor (HO2S) or the oxygen sensor (O2S). Removing the pigtail or the connector will affect sensor operation. Handle the oxygen sensor carefully. Do not drop the HO2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Do not use cleaning solvents of any type. Do not repair the wiring, connector or terminals. Replace the oxygen sensor if the pigtail wiring, connector, or terminal is damaged. This external clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors, or terminals could result in the obstruction of the air reference and degraded sensor performance.


NOTE
The following guidelines should be used when servicing the heated oxygen sensor:



Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor causing poor performance.
 
Do not damage the sensor pigtail and harness wires in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems.
 
Ensure the sensor or vehicle lead wires are not bent sharply or kinked. Sharp bends or kinks could block the reference air path through the lead wire.
 
Do not remove or defeat the oxygen sensor ground wire, where applicable. Vehicles that utilize the ground wired sensor may rely on this ground as the only ground contact to the sensor. Removal of the ground wire will cause poor engine performance.
 
Ensure that the peripheral seal remains intact on the vehicle harness connector in order to prevent damage due to water intrusion. The engine harness may be repaired using Packard's Crimp and Splice Seals Terminal Repair Kit. Under no circumstances should repairs be soldered since this could result in the air reference being obstructed.
 

  1. Remove the intake manifold sight shield.
  2.  
  3. Remove the connector position assurance (CPA) retainer.
  4.  
  5. Disconnect the bank 1 sensor 1 electrical connector.
  6.  
  7. Remove the bank 1 sensor 1 from the exhaust manifold.

    Click image to see an enlarged view

    Fig. Removing and installing HO2S1-5.3L Engine

  8.  

To install:


CAUTION
A special anti seize compound is used on the heated oxygen sensor threads. The compound consists of graphite suspended in fluid and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will already have the compound applied to the threads. If a sensor is removed from an engine and if for any reason is to be reinstalled, the threads must have anti seize compound applied before reinstallation.

  1. Coat the threads of heated oxygen sensor/catalyst monitor with anti seize compound P/N 12377953, or equivalent if necessary.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2.  
  3. Install the bank 1 sensor 1to the exhaust manifold and tighten the sensor to 31 ft. lbs. (42 Nm).
  4.  
  5. To complete installation, reverse remaining removal procedure.
  6.  

HO2S2

NOTE
Do not remove the pigtail from either the heated oxygen sensor (HO2S) or the oxygen sensor (O2S). Removing the pigtail or the connector will affect sensor operation. Handle the oxygen sensor carefully. Do not drop the HO2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Do not use cleaning solvents of any type. Do not repair the wiring, connector or terminals. Replace the oxygen sensor if the pigtail wiring, connector, or terminal is damaged. This external clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors, or terminals could result in the obstruction of the air reference and degraded sensor performance.


NOTE
The following guidelines should be used when servicing the heated oxygen sensor:



Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor causing poor performance.
 
Do not damage the sensor pigtail and harness wires in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems.
 
Ensure the sensor or vehicle lead wires are not bent sharply or kinked. Sharp bends or kinks could block the reference air path through the lead wire.
 
Do not remove or defeat the oxygen sensor ground wire, where applicable. Vehicles that utilize the ground wired sensor may rely on this ground as the only ground contact to the sensor. Removal of the ground wire will cause poor engine performance.
 
Ensure that the peripheral seal remains intact on the vehicle harness connector in order to prevent damage due to water intrusion. The engine harness may be repaired using Packard's Crimp and Splice Seals Terminal Repair Kit. Under no circumstances should repairs be soldered since this could result in the air reference being obstructed.
 

  1. Raise and support the vehicle.
  2.  
  3. Remove the connector position assurance (CPA) retainer.
  4.  
  5. Disconnect the bank 2 sensor 2 electrical connector.
  6.  
  7. Remove the bank 2 sensor 2 from the catalytic converter.
  8.  

To install:


CAUTION
A special anti seize compound is used on the heated oxygen sensor threads. The compound consists of graphite suspended in fluid and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will already have the compound applied to the threads. If a sensor is removed from an engine and if for any reason is to be reinstalled, the threads must have anti seize compound applied before reinstallation.

  1. Coat the threads of heated oxygen sensor/catalyst monitor with anti seize compound P/N 12377953, or equivalent if necessary.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2.  
  3. Install the bank 2 sensor 2 to the catalytic converter and tighten the sensor to 31 ft. lbs. (42 Nm).
  4.  
  5. To complete installation, reverse remaining removal procedure.
  6.  

Testing



Many intermittent open or shorted circuits come and go with harness and connector movement caused by vibration, engine torque, bumps and rough pavement, etc.

  1. Test the wiring harness and connectors by performing the following:

    Move the related connectors and wiring while monitoring the appropriate scan tool data.
     
    Move the related connectors and wiring with the component commanded ON and OFF, with the scan tool. Observe the components operation.
     
    With the engine running, move the related connectors and wiring while monitoring engine operation
     
    If harness or connector movement affects the data displayed, the component and system operation, or the engine operation, inspect and repair the harness or connections as necessary
     

  2.  
  3. Test the electrical connections and/or wiring by performing the following:

    Inspect for incorrect mating of the connector halves, or terminals not fully seated in the connector body, backed-out.
     
    Inspect for improperly formed or damaged terminals. Test for incorrect terminal tension.
     
    Inspect for poor terminal to wire connections including terminals crimped over insulation. This requires removing the terminal from the connector body.
     
    Inspect for corrosion or water intrusion. Pierced or damaged insulation can allow moisture to enter the wiring. The conductor can corrode inside the insulation with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits.
     
    Inspect for wires that are broken inside the insulation.
     

  4.  

 
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